Island



@uitrit tant gedient @Hita Leam Patent ivo. 80,399, dated July 28, 186s.

IMPROVEMENT IN LOW-WATER INDICATOR.

digi4 dpbule referat tu in time Enters nieut mit making um tf the stmt.

VTO ALL WHOM IT MAY CONCERN:

Be it known that I, THODOR G. EIswALD, of the city and county ot' Providence, and State of Rhode Island, have invented a new and improved'Low-Water Indicator;" and Ido hereby declare that the following is a full, clear,.and exact description of the construction and .operation of the same', reference being had'to the annexed drawings, making a part of this specification, in which-'- Figure 1 is' a sideelevation. i Figure 2'is a longitudinal vertical section.

The object of this invention is to furnish a neat'and convenientv` instrument, which, being attached to the Ahead of a steameboiler, will enable the engineer'at anytime to try the condition ofthe water in the boiler, and will of itself sound an alarm-whistle when the water gets too low for safety.

Inthe drawings, A represents the head of the boiler, and B is a horizontal tube, tapping it,'the`c onne c tion being formed by the screw b. A vertical pipe, C, terminating in a steam-whistle, D, screws into the upper side of thetube B.

E is a plug-valve, opening and closing the centra-l passage of the horizontal tube, and when it is seated, preventing the hot water or steam of the boiler 4from rising into the vertical pipe C, or from passing out beyond the valve towards the outer end of the horizontaltube: At the outer end of such tube is a chamber, F, formed by a cap, G, which screws upon Ythe'end of the tube B.

The extremity of the tube B projects slightly beyond the inner wall of the `chamber F, as seen at e, in order that it may form a valve-seat, upon which a valve, H, shall firmly seat itself.

The valve H is attached to a stem, I, which screws through the outer end wall of theV chamber, and as it i is rotated, in one directionV or the other, seats or unseats the valve, and allows the water or steam to pass around the valve and fill the chamber, whence it escapes through a short branch-pipe, J, to the open air. The diameter of the valve H being less than that of the chamber F, the steam or water will pass freely around it to the escape-pipe, whenever the valve is in the slightest degree removed from its seat.

The pipe C is at some convenient point providedwith a fusible plug, which will be fused .by the contact ofsteam, superheated to any given degreeand when fused, will be blown out of the pipe, Vleaving the steam free to sound the whistle D. i i v `I usuallyplace the plug at the top of the vertical pipe, in order to diminish the amount of heat conducted to it from the heated boiler-head, and render it less liable to be accidentally fused, thereby, as well'as forcenvenience in replacing it after it has been fused and blown out.`

l The valve H may be faced or packed-with any suitable material, such as leather, rubber, wood, dac., which, being held rmly1 against the end of the pipe at e e,4'will Veifectually close thc passagerrendering it water and steam-tight. I

This construction of the pipes and valves has several important advantages over all others `in use heretofore, among which may be mentioned that by closing' the valve E at any time, even when 'the steam is up, and

' the boiler heated, the fusible plug may be renewed in the pipe C, or the cap G may bc unscrewed and removed,

and a new facing added to the valve I-I, or any other repairs made upon it, without iu the slightest degree interfering with the' operation of the boiler or engine, and not only without loss of time, but with the greatest convenience.

The valve H forms a try-cock, andthe upright pipe C, withA its fusible plug, and its whistle, forms a lowwatcr indicator, both ybeing combined in a single instrument in my invention, and working in the most convenient manner in connection with each other.

l I am aware that a gauge-cock and whistle have been heretofore constructed together in one instrument, but this I do not claim.

,'What I do claiui as new, and desire to secure by Letters Patent, xs

The arrangement of the horizontal-pipe B, vertical whistle and fusible plug-tube C, plug-valve `E, chambered screw-cap G, and the valve H, with its stem I and handle K, as herein Shown and described.

To the above specification of myimprovement I have signed my hand, this 15th dayof April,1868

' THEODOR IG. EISWALD.

Witnesses:

Cues. A. Pnrri'r, SoLoN'C. Kuno-x. 

